The use of the PRARE and GPS (Global Positioning System) microwave tracking system is compared for orbit determination of a Low Earth Orbiter (LEO). Because the upward looking GPS system allows much longer contacts times than does the downward looking PRARE system, GPS appears to be superior for this particular application. It is recommended to determine the GPS orbits dynamically with 5 to 10 GPS reference receivers on the ground, and then to determine the LEO orbit geometrically from onboard GPS measurments to minimum 4 GPS satellites. In the present simulation, the orbits of 18 GPS satellites are computed by means of an analytical theory. On the basis of phase-smoothed pseudorange GPS measurement, LEO's orbit is found to be maintained to 4 m or better under realistic conditions.


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    Title :

    Orbit Recovery of a Low Earth Orbiter from Gps and Ground Tracking Stations


    Contributors:
    K. Aksnes (author) / D. Hoegvard (author) / S. Hauge (author)

    Publication date :

    1989


    Size :

    29 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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